I have a 2019 Chevy Silverado 2500hd duramax ltz z71 diesel truck. Great truck....
One problem has started today. When I went to Walmart, I parked at the bottom of the parking lot. I loaded my truck with groceries, then started my truck. The center dash said "Attempted break-in", I got out and looked around the truck, all was OK. When I got home, I unloaded the groceries. A few minutes later I heard the horn go off. I looked out the house window and saw nothing, I cut the horn off. A few minutes later, the horn goes off again. I cut the horn off, waited, the horn goes off again. I checked my GM or Chevy app, it said all is fine. I did noticed that on one of my batteries that one of the poles was corded. That might be the problem. I will clean it and get back if there are any other problems.